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(No Model.) I 2 Sheets-Sheet 1.

G. T. REISS. METAL'SVOREW MAQHINE.

No. 273,313. I N Patented Mar. 6, 18831 I WlfNESSES' \k INVENTOJ.

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(N0 Model.) 2 Sheets -she'et 2.

GQT, REISS. METAL SCREW MACHINE. No! 273,313. Patented Mair. 6 1883.

IV/I/IIII/ Ill l HIJIHHMII'IIIMMHIIIIIMIMMIIH 3' Ji 3 v a Q WITNESSES: v W [NVENTOR A TTORNEY M PETERS. Hwb-Liih s p Wamingm, IIC,

. NITE STATES GEORGE r. REISS, or

ATENT JFFIQE.

METAL. SCREW-MACHINE.

SPECIFICATION forming part of Letters Patent No. 273,313, dated March 6, 1883.

Application filed August 28, 1882.

' Screw-Machines, of which the following is a specification.

This invention rclatesto improvements in the details of construction of screw-machines or turret lathes, as hereinafter specified. In the drawings the improvements are shown as applied to an ordinary screw-machine or turret-lathe, and in this specification it is assumed that thereader is familiar with such machines.

In the accompanying drawings, Figure 1 is a front view of a screw-machine with my improvements; Fig. 2, an end view of the head; Fig. 3, a front view of a part of the bed, with details in section; Fig. I, a planof the foot of the machine; Fig. 5, a sectional plan of feedwork at the foot of the machine, and Fig. 6 a front view of part of gear I.

A is the bed of the machine; B, the headstock; 0, the sliding turret-block; D, the turret; E, the foot-screw for feeding the turretblock along the bed; F, the bearing for screw E; G, a flange on bearing F. for attaching it against the foot end of the bed; H, a handwheel fast on screw E; I and J, spur-gears of differentsize, loose on screw E; K, a bearing bolted to the rear of the bed at foot end; L and M, piuions of different size, fast on a shaft journaled in bearing K, and gearing int-o spurgears I and J; N, a lever for shifting a clutch device to fasten and loosen either of the spurgears I and J to the screw E; O, the tool-carriage of the machine; P, the apron of the carriage; Q, the carriage-nut; R, a lever for simultaneously withdrawing the tool from the work and the carriage-nut from the lead-screw; S, the tool-block; T, a dovetailed slide carrying the not Q, and moved a fixed distance across the carriage by the lever B, the toolblock S being adjustable on this slide by screwcrank, as usual; U, a bearing fixed against the front of the bed; V, a similar bearing nearer the foot of the bed; W, a similar hearing at the head of the bed; X, a hearing at the head, of the bed, on the rear side, in line with (No model.)

the spindle of the machine; Z, a wide gear engaging with gear Y and running on a stud, a, fixed in the face of the head-stock; cl, a shaft carried in bearings U and W; 71, a shaft carried behind the bed in bearings K and X; I), a gear on shaft (1, and engaging with wide gear Z; c, a gear on shaft lb, and engaging with wide gear Z; c, a short lead-screw carried by bearings U andV; f, a bushing in bearing V; g, a clutch in the end of shaft d, and engaging with the contiguous end of the bearingofleadscrew 0; z', a box orcase formed on bearingF; j, a clutch-collar sliding on screw E within box i;

70, a cotter'or-piu through collar j, and through v a mortise in screw E; Z, a clutch-pin fitted to slide in a longitudinal hole in screw E, and operated by collar j and lever N; m, the foot end of screw E; 'n, a cotter or clutch fast in pin 1, and projecting out therefrom through a mortise in screw-shankin to engage with either of the gears I J; 0, a counterbore in the abutting faces of gears I J to permit the gears to revolve without hinderauce from cotter a; 19, notches in the bottoms of counterbores o,iuto which cotter a may engage.

The apron P of the carriage is to have the usual hand-crank to operate a pinion for moving the carriage by hand. a

The gearing Y Z I), which actuates the leadscrew 6, is unalterable in its relation. Hence changeable lead-screws must be provided for cutting different pitches of screws.

The bushing fis of such outside diameter as to permit the lead-screw to be withdrawn and removed through the hole in bearing V. Bushingfmay be fixed in place by a set-screw, or otherwise.

A set of lead-screws is to be provided having different threads, but uniform otherwise, so that any one of the set may be put in place and properly engage with clutch g andfit properly in bearing U and bushing f. The carriage-nut Q must. be changed when leadscrews are changed. In some screw-machines these nuts are double-ended and boltinto place, so that only half as many are required as there are lead-screws in a set.

Gears Y Z c drive shaft h, pinions L M, and

bearing K at the foot of the bed; Y, a gear on 50 consequently gears I and J. The gearsl and 2. The combination, substantially as set J are of course revolved at different speeds, forth, of bed A, turret-block O, screw E, havand the screw E may thus have either of two ing a clutching device, hand-wheel H, gears I speeds of rotation imparted to it, according to J, pinions L M, and shaft h.

5 the position of cotter it. When cotter n is not engaging with either gear the screw E may be GEORGE T, REISS.

operated by hand-wheel H. j

I claim as my invention- Witnesses: 1. The combination, substantially as set J. W. SEE, 1o forth, of shaft d, bearings U and V, lead-screw NELSON WILLIAMS.

6, clutch g, and bushingf. 

